<button class="btn-upload" >
    <nz-progress
        [nzPercent]="uploader.progress"
        nzType="circle"
        [nzWidth]="60"
        *ngIf="isUploading"
        [hidden]="uploader.progress === 0"
    ></nz-progress>
    <ng-container *ngIf="!isUploading">
        <input
            type="file"
            ng2FileSelect
            [uploader]="uploader"
            (change)="selectedFileOnChanged($event)"
            multiple
        />
        <i class="anticon anticon-plus"></i>
        <span>点击上传</span>
    </ng-container>
</button>
